Which algebraic expression is a polynomial? 3m2n – startfraction 2 m over n endfraction + startfraction 1 over n endfraction startfraction 2 m n over 5 endfraction – startfraction startroot m endroot over 4 endfraction + 4m5 startfraction 4 m cubed over n squared endfraction – 3mn5 + startroot 8 endroot 7mn + startfraction 3 m over 2 endfraction + startfraction 5 n over 4 endfraction

what are the

answer:   the paragraph proof is mentioned below.

step-by-step explanation:

given: in a δxwy where

such that, ∠wzx ≅ ∠yzx and zw≅zy

we have to prove that: segment zx is a perpendicular bisector of segment wy.

prove: since, zw≅zy ⇒ ∠wzy is a supplementary angle.

then, ∠wzy= 180°

⇒∠wzx + ∠yzx = 180° ( because xz divides ∠wzy into two parts)

but, ∠wzx ≅ ∠yzx ( given)

⇒∠wzy+∠wzy=180° ( by substitution)

⇒2∠wzy=180°

⇒∠wzy=90°

⇒∠wzy=∠yzx =90°

therefore, xz⊥wy where wz=zy

⇒zx is a perpendicular bisector of wy.

the answer is "add 2y and y"

step-by-step explanation:

you need to collect the like terms first.